Update build-tools to ab/3638574
am: e465fa7f55

Change-Id: Ic78d73ea82ec364042324519b304ac2f609f1aab
tree: c328723e5534f8149f709229d5b2fe00fcab21d3
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml